NAD+ precursors found in human and animal milk
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https://www.nmn.com/news/tool-identifies-vitamin-b3-dairy
For these reasons, researchers developed a method based on a fluorometric, enzyme-coupled assay suitable for analyzing the content of NAD+ and its dietary precursors in milk from different species. The researchers showed that NR, NMN, and NAD+ were present in human and donkey milk, while they were selectively distributed in milk from cows, buffalo, sheep, and goats. Human milk was the richest source of NMN.
They saw that while most of the total vitamin B3 seems to be represented by NAD+ in sheep and goat milk, NR and NMN may account for a significant amount of the total vitamin B3 content in cow, buffalo, and human milk. “To our knowledge, this is the first evidence on the presence of NMN in a nutritional source, as well as the first quantitative determination of NR and NMN in food,” said the authors.
To assess NR bioavailability in processed foods, the researchers studied the influence of common heat treatments on cow milk content. The results showed that NR was resistant to pasteurization, but it was fully lost after the ultra-high temperature processing. “Our results indicate that NR does not resist [ultra-high temperature] treatment, therefore such process should be avoided in order to preserve the nutritional benefits of the vitamin,” said the authors.
